Abstract: Abstract: In order to promote information construction in Jiangxi rural areas, enrich cultural life of the farmers, a set of construction program for Jiangxi countryside terrestrial digital TV system based on DTMB (digital terrestrial multimedia broadcast) SFN (single frequency network) is proposed, which includes unified layout for provincial TV networks and three parts of the system. The system building is based on the LDPC (Low-Density-Parity-Check code) theory and synchronization principle, specification requirement of system structure and system testing for DTMB SFN. The system is referring to the construction experience of different SNF systems for digital terrestrial TV broadcasting and according to the landform characteristics in most parts of Jiangxi countryside. The system construction includes several steps as following. First, the compositions of front-end system include the new insertions of electronic program guide (EPG), CA (certification authority) encryption charger, SMS (storage management services) Database and webmaster, and with IP interface for different internet extension. Second, the details for SFN transmission system include the parameters selection for system, the coverage prediction and future testing. And last the constitution of the receiving system. For the areas can't be covered by the main and auxiliary transmission sites, specific implementation for broadband transmission supplement coverage system were proposed. The purpose of this system is to carry out the re-transmission for CCTV and domestic/abroad satellite TV. The digital operation system supports the local news live telecast, the insertion of EPG and the connection to the internet, etc., so that it will become an advanced, practical, sustainable developing multi-service platform. All above provides a scientific, economic and reliable reference for the new rural information construction and development in vast rural and remote mountainous areas in Jiangxi.